找回密碼
 申請討論區帳戶
查看: 1736|回復: 0

planetary systems dust production study

  [複製鏈接]
發表於 2015-10-3 06:47:49 | 顯示全部樓層 |閱讀模式
AAVSO Special Notice #408

October 2, 2015

Developing planetary systems dust production study - second segment
of observations


Further to AAVSO Alert Notice 511, issued in March 2015, Dr. George
Rieke (University of Arizona) and colleagues' campaign to monitor
planetary debris disks for variability using the Spitzer Space
Telescope continues. AAVSO observations are requested to rule out
variability of the stars themselves.

The second segment of observations of the four targets takes place
from now into January 2016 according to the schedule below.

Target          SpT             Age     Vmag    R.A. (2000)  Dec. (2000)        Spitzer visibility windows in 2015
                                         (Myr)                                                                   First segment   Second segment
RZ Psc          KOIV    35      11.29   01 09 42.06  +27 57 01.95       Mar 14-Apr 24   Oct 10-Nov 20
HD 15407A       F5V             80      6.95    02 30 50.66  +55 32 54.2        Apr 5-May 24    Nov 7-Dec 28
V488 Per        KOIV    60      12.83   03 28 18.68  +48 39 48.2        Apr 17-May 30   Nov 15-Dec 31
HD 23514        F5V             150     9.43    03 46 38.40  +22 55 11.2        Apr 18-May 26   Nov 13-Dec 23
  
Observers may recall that during the first segment, the stars were
extremely near conjunction and very difficult or impossible to
observe from the ground. During this second segment, they are much
better placed and should be straightforward targets.

As before, observations in V are requested, with a S/N of about
100 so that the accuracy will be 1-2%. Observations should begin
at least one week before the visibility window opens and finish one
week after the window closes.

No specific comparison stars are assigned for each target, but
observers are requested to use only those in the sequences available
via the AAVSO Variable Star Plotter (VSP, [url]http://www.aavso.org/vsp[/url]).
It is essential that observers report the comparison stars used when
submitting their observations to the AAVSO.

Observations should be submitted to the AAVSO International
Database using the names RZ PSC, HD 15407A, HD 23514, and V488 PER,
respectively.

Please see AAVSO Alert Notice 511
(https://www.aavso.org/aavso-alert-notice-511) for more information
about this very interesting campaign.

During a similar campaign in 2013 (see AAVSO Alert Notice 482,
https://www.aavso.org/aavso-alert-notice-482), AAVSO observers
provided data that were critical to its success. Yesterday, Dr.
Rieke wrote: "...we really appreciate the support from AAVSO - it
is a key part of our science (and resulted in the observers who
provided data last time being co-authors of our paper, which seemed
to make them quite pleased!)."


This AAVSO Special Notice was compiled by Elizabeth Waagen.

----------------------------------
SUBMIT OBSERVATIONS TO THE AAVSO

Information on submitting observations to the AAVSO may be found at:
http://www.aavso.org/webobs

SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

A Special Notice archive is available at the following URL:
http://www.aavso.org/special-notice-archive

Subscribing and Unsubscribing may be done at the following URL:
http://www.aavso.org/observation-notification#specialnotices

您需要登錄後才可以回帖 登錄 | 申請討論區帳戶

本版積分規則

Archiver|手機版|小黑屋|香港天文學會

GMT+8, 2024-3-29 00:12 , Processed in 0.013014 second(s), 16 queries .

Powered by Discuz! X3.5

© 2001-2024 Discuz! Team.

快速回復 返回頂部 返回列表